<template>
    <div class="login_container">
      <div class="login_box">
        <!--头像区域-->
        <div class="avatar_box">
          <img src="../assets/logo.png" alt="">
        </div>
        <!--登录表单区域-->
        <el-form ref="loginFormRef" label-width="0px" class="login_form" :model="loginForm" :rules="loginFormRules">
          <!--用户名-->
          <el-form-item prop="username">
            <el-input v-model="loginForm.username" prefix-icon="el-icon-s-custom"></el-input>
          </el-form-item>
          <!--密码-->
          <el-form-item prop="password">
            <el-input v-model="loginForm.password" prefix-icon="el-icon-lock" type="password"></el-input>
          </el-form-item>
          <!--按钮区域-->
          <el-form-item class="btns">
            <el-button type="primary" @click="login">登录</el-button>
            <el-button type="info" @click="resetLoginForm">重置</el-button>
          </el-form-item>
        </el-form>
      </div>
    </div>
</template>

<script>
export default {
  name: 'LoginPage',
  data () {
    return {
      // 表单的数据绑定对象
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      // 表单验证规则对象
      loginFormRules: {
        username: [
          { required: true, message: '请输入登录名称', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入登录密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    resetLoginForm () {
      this.$refs.loginFormRef.resetFields()
    },
    login () {
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) {
          return false
        } else {
          const { data: result } = await this.$http.post('login', this.loginForm)
          if (result.meta.status !== 200) {
            return this.$message.error('登录失败')
          } else {
            this.$message.success('登录成功')
            // 1 将登录成功之后的token,保存到客户端的sessionStorage中
            // 1.1 项目中除了登录之外的其他API，必须在登录之后才能访问
            // 1.2 token只应在当前网站打开期间生效，所以将token保存在sessionStorage中
            console.log(result)
            window.sessionStorage.setItem('token', result.data.token)
            // 2 通过编程式导航跳转到后台主页，路由地址是 /home
            this.$router.push('/home')
          }
        }
      })
    }
  }
}
</script>

<style lang="less" scoped>
  .login_container{
    background-color: #2b4b6b;
    height: 100%;
  }

  .login_box{
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);

    .avatar_box{
        height: 130px;
        width: 130px;
        border: 1px solid #eee;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 10px #ddd;
        position: absolute;
        left: 50%;
        transform: translate(-50%, -50%);
        background-color: #fff;
        img {
            width: 100%;
            height: 100%;
            border-radius: 50%;
            background-color: #eee;
        }
    }
  }

  .login_form{
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
  }

  .btns {
    display: flex;
    justify-content: flex-end;
  }
</style>
